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  1. #include <bits/stdc++.h>
  2. using namespace std;
  3. const long long MOD = 1e9 + 7;
  4. int n;
  5. string s;
  6. long long dp[3005][3005];
  7.  
  8. main() {
  9.     ios_base::sync_with_stdio(false);
  10.     cin.tie(0); cout.tie(0);
  11.     freopen("TEST.inp", "r", stdin);
  12.     freopen("TEST.out", "w", stdout);
  13.     cin >> n;
  14.     cin >> s;
  15.  
  16.     s = " " + s;
  17.     dp[1][1] = 1;
  18.     for (int i = 2; i <= n; i++) {
  19.         if (s[i - 1] == '<') {
  20.             for (int j = 1; j <= i; j++)
  21.                 dp[i][j] = dp[i - 1][j - 1];
  22.         } else {
  23.             for (int j = 1; j <= i; j++) {
  24.                 dp[i][j] = dp[i - 1][i - 1] - dp[i - 1][j - 1];
  25.                 if (dp[i][j] < 0) dp[i][j] += MOD;
  26.             }
  27.         }
  28.         for (int j = 1; j <= i; j++) {
  29.             dp[i][j] += dp[i][j - 1];
  30.             if (dp[i][j] >= MOD) dp[i][j] -= MOD;
  31.         }
  32.     }
  33.  
  34.     cout << dp[n][n] << '\n';
  35.  
  36.     return 0;
  37. }
  38.  
Success #stdin #stdout 0.01s 5288KB
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https://ideone.com/xUun0O
language:
C++14 (gcc 8.3)
created:
14 hours ago
visibility:
public

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